Teach Skia to use discardable memory

Source/core/platform/graphics/DeferredImageDecoder.h

Index: Source/core/platform/graphics/DeferredImageDecoder.h
diff --git a/Source/core/platform/graphics/DeferredImageDecoder.h b/Source/core/platform/graphics/DeferredImageDecoder.h
index 4f5f549980fb0f5323781c462a81025992cc12cc..d67eb2edc420a2e016bb02f353eb73a23c6c4913 100644
--- a/Source/core/platform/graphics/DeferredImageDecoder.h
+++ b/Source/core/platform/graphics/DeferredImageDecoder.h
@@ -49,6 +49,7 @@ public:
     static bool isLazyDecoded(const SkBitmap&);
 
     static void setEnabled(bool);
+    static void setEnabledSkiaDiscardableMemory(bool);

[Stephen White, 2013/12/05 21:52:14]

Nit: kind of awkward. Could this be setSkiaDiscardableMemoryEnabled()?

[Alpha Left Google, 2013/12/08 00:30:11]

Done.

 
     String filenameExtension() const;
 
@@ -75,6 +76,8 @@ public:
 private:
     explicit DeferredImageDecoder(PassOwnPtr<ImageDecoder> actualDecoder);
     void prepareLazyDecodedFrames();
+    SkBitmap createBitmap(size_t index);
+    SkBitmap createSkiaDiscardableBitmap(size_t index);
     SkBitmap createLazyDecodingBitmap(size_t index);
     void activateLazyDecoding();
     void setData(PassRefPtr<SharedBuffer>, bool allDataReceived);
@@ -92,6 +95,7 @@ private:
     RefPtr<ImageFrameGenerator> m_frameGenerator;
 
     static bool s_enabled;
+    static bool s_enabledSkiaDiscardableMemory;
 };
 
 } // namespace WebCore